When should I start treating it. There are very few surface leaves right now but it will warm up in a few weeks. Should I start as soon as the leaves start showing or let them grow a bit then start. I don’t want to let them get back to where they were last year before starting treatments.
I'd wait until the leaves on the water surface get to be about 50% the coverage that they were last year, then hit them with the liquid. That will help minimize the number of times you will have to spray.
